Site restructuring. Will the position of the site in the search results change?

Question

Google

It is necessary to transfer the site to "new wheels", tentatively to Yii2, now the site is implemented on WP.
The position of the site in the search results will change if the text content of the site:
1) Changes
2) Does not change
If the position changes, then when can we expect the positions to return?

Answer 1

1) If you change the content of the site, the positions will change
2) If you do not save the structure of the site, the positions will change
3) If you do not glue the old addresses to the new ones, the positions will change
But the return time is an individual question. From very fast to never

Answer 2

I will clarify the previous answer, there may not be a return (or a drawdown) if the PS considers the new changes worse than the previous ones.